As for the application of biomass energy, the scope is very small and has very big limitations.

It is precisely because of this situation that Shang Yiyun asked Chen Feiyun to borrow these books from the library, because he wanted to see if there could be new developments in the field of biomass energy.

If he can think of it and can achieve something in related fields, he can not only get fame, but also profit, in short, fame and fortune.

Of course, there are no achievements in related fields, and it is too early to think about these things.

However, he didn't know much about the knowledge related to biomass energy before, but now it is different from before, and by studying the knowledge in the book, he also has a deeper understanding of biomass energy.

But if he wants to make any achievements, he doesn't have that ability, and his current knowledge in related fields is only a preliminary mastery.

It took me a while to read the book, and it was already noon, and it was time for lunch.

"Fei Yun, it's noon now, let's go to the cafeteria to eat. ”

At this time, Chen Feiyun heard Shang Yiyun's words, nodded, and followed Shang Yiyun's footsteps and left the library of Huaguo Normal University.

The distance between the library and the cafeteria is not far, so after walking for a few minutes, I came to the cafeteria, and I found that the cafeteria was deserted, and it was not surprising to look at the time.

There are still 15 minutes before the end of school, and the large army has not yet come, so naturally there are relatively few.

But he knew in his heart that this was only a temporary phenomenon, and in 15 minutes, the cafeteria would be a different scene.

These things didn't have much to do with him, and after coming to the cafeteria, both of them picked out their favorite food, and then found a place to start enjoying the food.

During the meal in the cafeteria, nothing special happened, everything was normal, and when the two of them solved the lunch problem, they walked out of the cafeteria and began to walk around the campus.

Shang Yiyun still has classes in the afternoon, so he can't take Chen Feiyun to the city to play, so he can only wait until his free time to think about this kind of thing.

Although you can't go out, walking around the campus of Huaguo Normal University is also a better choice, as long as the two of you are together, you don't care what you do.

After coming out of the cafeteria, Chen Feiyun proposed to go to the back mountain of the school to have a look.

Shang Yiyun did not object to this proposal, and in this way, the two walked to the back mountain of the school, although it is called the back mountain, but it is just a small dirt slope.

The trees are thick, but it also has the appearance of a mountain forest.

The place is deserted, and only some people with a curious mind visit this place, so after the two have been walking for a while, they haven't seen anyone else.

Faced with this situation, Shang Yiyun also regretted coming to this place in his heart, the trees here are overgrown and the weeds are abundant, if a snake suddenly sprang out, it would also make people frightened.

Now that he was halfway through, Shang Yiyun already had a retreat in his heart, but when he saw Chen Feiyun's excited appearance, he didn't say it.

Now there was only one way to get to the dark, but he carefully watched his surroundings and beware of the sudden appearance of some frightening creatures.

Although he wouldn't be afraid, he wasn't sure if Chen Feiyun would be afraid, so he could only carefully observe the situation around him.

In this way, time passed minute by minute, and the two also came to the top, and some of the school's buildings were unobstructed, but there was also a feeling that they would be at the top of the mountain and see the mountains at a glance.

After sighing with emotion, Shang Yiyun urged Chen Feiyun to leave this place quickly, and the two walked down from the other side.

Along the way, they didn't encounter any creatures such as snakes and rats, and when the two of them walked down, they found a small pavilion and sat down.

"Fei Yun, just now I was really worried that a snake would suddenly come out and scare you, but fortunately, I didn't encounter anything special along the way, which is a great luck. ”

When Chen Feiyun heard Shang Yiyun's words, she was also moved in her heart, and said softly.

"Yi Yun, I believe you will protect me, so I'm not afraid. ”

The two spoke heartily, as if there were only two people left in heaven and earth, and only each other could be accommodated in their eyes.

In this atmosphere, Shang Yiyun's eyes were only left with tenderness.

However, he didn't forget that there was still class this afternoon, and the two of them experienced the trip to the "back mountain", which took half an hour, and now there is still more than an hour before 2:00 in the afternoon, although there is still a period of time, but Shang Yiyun has other things to do.

It is precisely because of this that he can only offer a farewell.

Fortunately, Chen Feiyun is very understanding and will not force him to stay.

In Chen Feiyun's reluctant gaze, Shang Yiyun slowly disappeared in front of her eyes.

At this time, Chen Feiyun also returned to the dormitory, and she also had classes in the afternoon, so now she has to go back to the dormitory to prepare.

After leaving Huaguo Normal University, Shang Yiyun returned directly to Kyoto University.

The reason why he chose to come back at this time was because he had just received a phone call.

The person who called him was his teacher Chen Dezhi, and the two chatted for a while, and Shang Yiyun knew his teacher and the reason for calling him.

It turned out that there would be students from Huaqing University coming to exchange in the near future, although it was said to be an exchange on the surface, but in fact it was a secret competition.

Kyoto University and Huaqing University, two top universities in China, although they usually need to cooperate in many aspects, they also often engage in secret competitions, which can also be said to love and kill each other.

Therefore, Chen Dezhi called Shang Yiyun and wanted him to be a king and surprise Huaqing University.

It was precisely because of this that Shang Yiyun gave up the time to continue to live with Chen Feiyun and returned directly to Kyoto University.

This exchange was held this afternoon, so he had to prepare in advance, and at this time he had to go to the counselor to ask for leave.

When I passed by the print shop, I printed a leave slip and went to the counselor's office with the slip.

It was already half past twelve at noon, and he didn't know that the counselor was not in the office right now, so he had to try his luck.

When he came to the door of the counselor's office, he knocked on the door, and when he heard a voice coming from inside, he was very happy, because it meant that the counselor was in the office.

Pushing open the door and walking in, I saw the counselor lying on the table writing something, faced with this situation, Shang Yiyun did not disturb the other party, but waited by the side for a while.

"Shang Yiyun, do you have something to do here?"

At this time, the counselor's voice reached his ears, and he was not surprised why the counselor would know his name.

But he hasn't forgotten why he's here.

"Teacher Sun, I am here to ask for leave, this afternoon, students from Huaqing University are coming to our school for exchange, and my teacher, Professor Chen Dezhi, wants me to participate in this exchange activity, so I want to ask you for leave in the afternoon. ”

After saying the reason, Shang Yiyun waited for the other party's reply.

For such a thing as asking for leave, he is not worried that the counselor will not agree.

"It turned out to be this kind of thing, but I didn't expect that an alternative existence like you would appear in our School of Philosophy. ”

When he said this, the counselor wrote his name on the leave slip.

The purpose of coming here has been achieved, Shang Yiyun is ready to leave here, ready to return to the dormitory, mainly to do two things, the first thing is to put the book in his hand in the bookshelf, and the second thing is to give the leave note to his roommate, so that they can hand it over to the teacher during class.

After doing these things, Shang Yiyun went to the office of the teacher Chen Dezhi, and the exchange was about to begin, but he didn't know the topic of the exchange, so he was going to Chen Dezhi's office now to talk to his teacher.

When he came to the door of the office, he knocked on the door, heard the reply, and then pushed the door open and walked in.

After walking in, Shang Yiyun didn't have any extra nonsense, and asked directly. "Teacher, I didn't ask about the topic of the afternoon exchange on the phone just now, can you tell me about it now?"

Time was running out and he wanted to know more.

At this time, when Chen Dezhi heard Shang Yiyun's words, you showed an inexplicable smile, and then said.

"You have a great advantage in the topic of this exchange, because this topic is related to new energy, and you are studying this thing, I believe you have a deeper understanding. ”

Shang Yiyun still didn't hear the specific topic from this sentence, but he felt that his teacher hadn't finished speaking, so he continued to listen.

Sure enough, after a pause, Chen Dezhi continued.

"The topic of discussion this time is hydrogen energy, I wonder how much you know about this?"

Speaking of which, Chen Dezhi waited for his reply from Shang Yiyun.

"Teacher, when I was studying graphene batteries before, I also knew something about hydrogen energy, because there is a solid oxide battery, and its ideal fuel is hydrogen, because it is the reverse reaction of electrolysis to produce hydrogen. ”

At this moment, Chen Dezhi heard Shang Yiyun's reply, and he had a bottom in his heart.

In the next time, the two will not continue to talk about this topic, but talk about some other things, such as talking about things related to Chen Feiyun.

In this way, Shang Yiyun stayed in Chen Dezhi's office for an hour, and then had to leave here, because there was still half an hour before the time for the exchange between the two schools, and if he delayed any longer, he might be late.

After leaving the teacher's office, he went straight to the place where the two schools were exchanged, which was in the library.

On the way to the library, Shang Yiyun was thinking about the knowledge related to hydrogen energy.

He didn't expect that the topic of this exchange would be this new energy, if it weren't for the fact that he was interested in solid oxide batteries in the process of researching graphene batteries, his understanding of hydrogen energy would be very shallow.

But now he doesn't have to worry about everything, since he knows which aspect of knowledge to communicate, he has a bottom in his heart.

Hydrogen is the most widely distributed substance in the universe and constitutes 75% of the mass of the universe and is a secondary energy source.

Hydrogen energy in the 21st century is likely to be on the world energy stage, become a pivotal energy source, hydrogen production, storage, transportation, application technology will also become the focus of attention in the 21st century, hydrogen has the characteristics of high calorific value of combustion, is 3 times that of gasoline, 3.9 times of alcohol, 4.5 times of coke.

For hydrogen energy, a new energy source, Shangyiyun is very interested, because the product of hydrogen combustion is water, which is the cleanest energy source in the world.

Hydrogen is at the top of the periodic table, its atomic number is 1, it is gaseous at room temperature and pressure, and it can become liquid at ultra-low temperature and high pressure. As an energy source, hydrogen has eight characteristics:

One is that hydrogen is the lightest of all elements, with a density of 0.0899 gL in the standard state, and at -252.7 °C, it can become a liquid, and if the pressure is increased to hundreds of atmospheres, liquid hydrogen can become solid hydrogen.

Second, among all gases, hydrogen has the best thermal conductivity, which is 10 times higher than that of most gases, so hydrogen is a good heat transfer carrier in the energy industry.

The third is that hydrogen is the most common element in nature, it is estimated that it constitutes 75% of the mass of the universe, in addition to the hydrogen contained in the air, it is mainly stored in the form of compounds in water, and water is the most widespread substance on the earth, it is estimated that if all the hydrogen in the seawater is extracted, the total heat it produces is 9,000 times greater than the heat released by all fossil fuels on the earth.

Fourth, the calorific value of hydrogen is the highest among all fossil fuels, chemical fuels and biofuels, at 142,351 kJkg, which is three times that of gasoline.

Fifth, hydrogen has good combustion performance, fast ignition, a wide range of flammability when mixed with air, and a high ignition point and fast combustion speed.

Sixth, hydrogen itself is non-toxic, compared with other fuels, hydrogen combustion is the cleanest, in addition to the generation of water and a small amount of ammonia will not produce such as carbon monoxide, carbon dioxide, hydrocarbons, lead and dust particles and other harmful pollutants to the environment, a small amount of ammonia will not pollute the environment after proper treatment, and the water generated by combustion can continue to produce hydrogen, repeated recycling.

Seventh, hydrogen energy can be used in many forms, which can not only produce heat energy through combustion, generate mechanical work in thermal engines, but also be used as energy materials for fuel cells, or converted into solid hydrogen for structural materials. The use of hydrogen instead of coal and oil does not require major modifications to existing technical equipment, and existing internal combustion engines can be used with minor modifications.

Eighth, hydrogen can appear as gaseous, liquid or solid hydride, which can adapt to the different requirements of storage, transportation and various application environments.

After learning about hydrogen energy, Shangyiyun decided that after the successful research of graphene batteries, the next research goal is hydrogen energy.

Of course, it's still a little early to think about these things, and another kind of graphene battery has not yet been successfully studied, so in the freshman year, it is impossible to study hydrogen energy.

This kind of thing can only be considered in the sophomore year, and just as he was thinking about it, he had come to the library before he knew it.

When Shang Yiyun walked in, he found that there were already many people in the entire space, and his arrival did not make much waves.

Shang Yiyun didn't care about this situation, he didn't come here to show off.

I just found a place to sit down and began to wait for the exchange meeting to officially begin.